 January 2005, Part 1
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1. A ball dropped from rest falls freely until it hits the ground with a speed of 20 meters per second. The time during which the ball is in free fall is approximately

(1) 1 s
(2) 2 s
(3) 0.5 s
(4) 10 s

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2. In a 4.0-kilometer race, a runner completes the first kilometer in 5.9 minutes, the second kilometer in 6.2 minutes, the third kilometer in 6.3 minutes, and the final kilometer in 6.0 minutes. The average speed of the runner for the race is approximately

(1) 0.16 km/min
(2) 0.33 km/min
(3) 12 km/min
(4) 24 km/min

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3. A golf ball is hit with an initial velocity of 15 meters per second at an angle of 35 degrees above the horizontal. What is the vertical component of the golf ball’s initial velocity?

(1) 8.6 m/s
(2) 9.8 m/s
(3) 12 m/s
(4) 15 m/s

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4. In the diagram below, a 60.-kilogram rollerskater exerts a 10.-newton force on a 30.-kilogram rollerskater for 0.20 second. What is the magnitude of the impulse applied to the 30.-kilogram rollerskater?

(1) 50. N•s
(2) 2.0 N•s
(3) 6.0 N•s
(4) 12 N•s

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Note that question 5 has only three choices.

5. In the diagram below, a 10.-kilogram block is at rest on a plane inclined at 15° to the horizontal. As the angle of the incline is increased to 30.°, the mass of the block will

(1) decrease
(2) increase
(3) remain the same

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6 If the direction of a moving car changes and its speed remains constant, which quantity must remain the same?

(1) velocity
(2) momentum
(3) displacement
(4) kinetic energy

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7. Two carts are pushed apart by an expanding spring, as shown in the diagram below. If the average force on the 1-kilogram cart is 1 newton, what is the average force on the 2-kilogram cart?

(1) 1 N
(2) 0.0 N
(3) 0.5 N
(4) 4 N

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8. A lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cart-mass system with the greatest inertia? 1 2 3 4
9. The diagram below shows a sled and rider sliding down a snow-covered hill that makes an angle of 30.° with the horizontal. Which vector best represents the direction of the normal force, FN, exerted by the hill on the sled? 1 2 3 4
10. The diagram below shows two pulses of equal amplitude, A, approaching point P along a uniform string. When the two pulses meet at P, the vertical displacement of the string at P will be

(1) A
(2) 2A
(3) 0
(4) ½ A

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11. The energy of a water wave is most closely related to its

(1) frequency
(2) wavelength
(3) period
(4) amplitude

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12. Which form(s) of energy can be transmitted through a vacuum?

(1) light, only
(2) sound, only
(3) both light and sound
(4) neither light nor sound

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13. A tuning fork vibrating in air produces sound waves. These waves are best classified as

(1) transverse, because the air molecules are vibrating parallel to the direction of wave motion
(2) transverse, because the air molecules are vibrating perpendicular to the direction of wave motion
(3) longitudinal, because the air molecules are vibrating parallel to the direction of wave motion
(4) longitudinal, because the air molecules are vibrating perpendicular to the direction of wave motion

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14. A student in a band notices that a drum vibrates when another instrument emits a certain frequency note. This phenomenon illustrates

(1) reflection
(2) resonance
(3) refraction
(4) diffraction

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15. Which quantity is equivalent to the product of the absolute index of refraction of water and the speed of light in water?

(1) wavelength of light in a vacuum
(2) frequency of light in water
(3) sine of the angle of incidence
(4) speed of light in a vacuum

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16 Radio waves and gamma rays traveling in space have the same

(1) frequency
(2) wavelength
(3) period
(4) speed

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17. The spreading of a wave into the region behind an obstruction is called

(1) diffraction
(2) absorption
(3) reflection
(4) refraction

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18. The diagram below represents a wave moving toward the right side of this page. Which wave shown below could produce a standing wave with the original wave? 1 2 3 4
19. A train sounds a whistle of constant frequency as it leaves the train station. Compared to the sound emitted by the whistle, the sound that the passengers standing on the platform hear has a frequency that is

(1) lower, because the sound-wave fronts reach the platform at a frequency lower than the frequency at which they are produced
(2) lower, because the sound-waves travel more slowly in the still air above the platform than in the rushing air near the train
(3) higher, because the sound-wave fronts reach the platform at a frequency higher than the frequency at which they are produced
(4) higher, because the sound-waves travel faster in the still air above the platform than in the rushing air near the train

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20. What is the gravitational potential energy with respect to the surface of the water of a 75.0-kilogram diver located 3.00 meters above the water?

(1) 2.17 × 104 J
(2) 2.21 × 103 J
(3) 2.25 × 102 J
(4) 2.29 × 101 J Additional Tests
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